/*
 * Created on Feb 8, 2007
 * Created by Paul Gardner
 * Copyright (C) Azureus Software, Inc, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

package com.aelitis.azureus.util;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.gudy.azureus2.core3.util.Debug;
import org.gudy.azureus2.plugins.PluginInterface;

import com.aelitis.azureus.core.AzureusCore;
import com.aelitis.azureus.plugins.magnet.MagnetPlugin;
import com.aelitis.azureus.plugins.magnet.MagnetPluginListener;

public class ExternalStimulusHandler {
    private static MagnetPlugin magnet_plugin;
    private static List pending_listeners;

    protected static void initialise(AzureusCore core) {
        PluginInterface pi = core.getPluginManager().getPluginInterfaceByClass(MagnetPlugin.class);

        if (pi != null) {

            MagnetPlugin temp = (MagnetPlugin) pi.getPlugin();

            List to_add;

            synchronized (ExternalStimulusHandler.class) {

                magnet_plugin = temp;

                to_add = pending_listeners;

                pending_listeners = null;
            }

            if (to_add != null) {

                for (int i = 0; i < to_add.size(); i++) {

                    addListener((ExternalStimulusListener) to_add.get(i));
                }
            }
        } else {

            Debug.out("Failed to resolve magnet plugin");
        }

        // Debug.outNoStack( "ExternalStimulus debug" );

        addListener(new ExternalStimulusListener() {
            public boolean receive(String name, Map values) {
                // System.out.println( "ExternalStimulus: " + name );
                // System.out.println("  " + (values == null ? -1 : values.size())
                // + " Values: " + values);

                return (name.equals("ExternalStimulus.test"));
            }

            public int query(String name, Map values) {
                return (Integer.MIN_VALUE);
            }
        });
    }

    public static void addListener(final ExternalStimulusListener listener) {
        synchronized (ExternalStimulusHandler.class) {

            if (magnet_plugin == null) {

                if (pending_listeners == null) {

                    pending_listeners = new ArrayList();
                }

                pending_listeners.add(listener);

                return;
            }
        }

        if (magnet_plugin != null) {

            magnet_plugin.addListener(new MagnetPluginListener() {
                public boolean set(String name, Map values) {
                    try {
                        return (listener.receive(name, values));

                    } catch (Throwable e) {

                        Debug.out(e);

                        return false;
                    }
                }

                public int get(String name, Map values) {
                    try {
                        return (listener.query(name, values));

                    } catch (Throwable e) {

                        Debug.out(e);

                        return (Integer.MIN_VALUE);
                    }
                }
            });
        }
    }
}
